Heating carburetors



Patented Dec. 17, 1929 UNITED STATES PATENT OFFICE ANTONIN BOULADE, OF`LYN, FRANCE, AASSIGNOR T SOCIETE DU CAJR/BURATEU'B,l ZENITH, 0F LYON, FRANCE, A CORPORATIN 0F IFB-ANCE HEATING cAnBUnnrons Application led August 31, 1926, Serial No.

This invention relates to the heating of carburetors and is particularly valuable in carburetors which arefv employed in aviation motors, although the invention has other applications.4

' It is common practice to supply a 4heating fiuid to a carburetor jacket, but difficulties have been experienced in regulating the intensity of heating. If the carburetor is not heated sufficiently, an ice deposit forms therein and'if, on the other hand, it is subjected to too much heat, a loss of power is experienced.

It has been attempted to vary the heating effect by varying the quantity of heating liuid which is circulated. In practice, however, it

is found very difficult to properly adjust the circulation rate on account of the large heat capacity of the Huid employed.

I provide for supplying a. heating fluid and by. For this purpose I preferably provide a carburetor jacket havin a plurality of portions with means for-se actively `associating the several jacket portions with the circulatory System. In the accompanyn drawings which illustrate moreor less agrammatically two" embodiments of my. invention,

Figure 1 is a diagrammatic view illustrating one embodiment of my invention;

Figure 2 is a similarview showing another form of the invention;

Figure 3 is a fragmentary view of a por- -tion of Figure 2 showing the regulating valve in adifierent position, and Figures 4 and 5 are vertical sections to enlarged scale through. a desired 'form of valve which is preferablyused in connection with the system of Figure 2.

Referring first to Figure `1, there is shown a carburetor lhaving a oat chamber 2, an air in-take 3, venturi 4 and throttle 5.

' The carburetor is jacketed for the circulation of heating fluid. The lfluid is supplied through a conduit 6 and is taken ofi` through a conduit7. The jacket is divided into three parts by walls 8, the air in-take 3 having a jacket portion 9, the venturi 4 havinga jacket portion 10 and the throttle 5 having a jacket lthe jacket portion 20 and the branch pipe 24 ',20El and 211L and an outlet conduit 23a.

132,693, and in France September 19, 1925.

portion 11. The jacket portion 9 is also effective for heating the float chamber 2.

The conduit 6 is provided with branches 9a, l0n and 11, each having a pet-cock l2 therein. By opening or closing the several pet-cocks, the flow ofheating fluid through. the several jacket portions may be regulated as desired. Each of the jacket portions is connected tothe outlet vconduit 7 through branch pipes 7a. G9

Figure 2 shows a modified form of apparatus in which only two jacket portions 20 and 21 are provided. Heating fluid is supplied through a conduit 22 and is taken off through a conduit 23.v

The jacket portion 20 is provided with a branch pipe 24 near the bottom, leading from the jacket portion-to the conduit 23, and is also provided with conduit 25 terminating in a valvechamber 26. The valve chamber 26 is varying the area of the surface heated thereconnected to the conduit 23, as shown, and is also connected through a conduit 27 to the acket ortion 21. A three-way valve memer 28 1s provided in the valve chamber 26. With the valve member 28 in the position shown in Figure 2, heating fluid flows Ithrough the conduit 22 to the jacket portion 21, thence through the conduit 27 and the valve member 28 to the conduit 25 through to the outlet conduit 23.

If it is found that with such clrculatlon,

' the carburetor is too hot, the valve member 28 isv turned to .the position shown in Figure 3. The fluid then flows fromy the jacket portlon 21 through the conduit 27 and thence through the valve member 28 direct to the conduit 23. The circulation of heating fluid through the. jacketportion 20 is thus cut ofi' and the effective heating surface is materially reduced. Figure 4 shows a desired form ofvalve for use in place of the three-way cock, which is diagrammatically illustrated in Figures 2 and 3. The drawing shows jacket portions The outlet 23a terminates in a valve casing 30 secured to the side of the carburetor. The casing 30 is divided into two compartments, 31 and 32, by a division wall 33. A conduit '34 connects the compartment 32 with the jacket 100 compartment 31 with the jacket portion 20".

A valve is provided in the compartment 32.

This valve has a face 36 which finds a seat on the division wall 33 and a face 37 which is provided with a threaded seat 38. The valve member is provided with a downwardly extending slotted portion 39 having holes 40 therein for the passage of fluid. The slotted portion 39 engages a pin 41 which' prevents the valve from turning.

The valve is provided with a threaded hole into which is fitted a screw 42. The screw is provided at its upper end with a valve portion 43 which is fitted against a wall of the valve body 30.

The screw 42 extends outwardly through a hole in the casing 30 and is provided with a squared portion 44 over which is fitted a knurled wheel 45. A screw 46 holds the knurledv wheel in place and a strong spring 47 is provided for urging the valve portion 43 against its seat and thus maintaining a constant seal atthis point.

Vith the parts shown in the position of Figure 4, fluid flows Vfrom the jacket portion 21a through the conduit 34 and thence to the conduit 23a. If the knurled wheel 45 is turned so as to thread the screw 42 out of the valve, the valve is thus forced to move to the position of Figure 5. I/Vith the parts in the position shown in Figure 5, the fluid flows from the jacket portion 21a through the conduit 34, thence through the opening in the division wall 33 to the compartment 31. From here it flows through the conduit 35 to the jacket portion 20a and then to the outlet conduit, the circulation being as shown in Figure 2.

The invention provides a simple and effect1ve means for varying the heating effect of the fluid on the carburetors. The arrangement is much more desirable than schemes where it is attempted to control the heating' effect by merely varying the quantity of fluid supplied.

I have illustrated and described a referred form of the invention, but it will e understood that it may be otherwise embodied or practiced `within the scope of the following claims I claim:

In a carburetor, a jacket portion, covering substantially the entire outside wall of the carburetor, means .for subdividing the jacket portion into a plurality of sections, a -supply conduit for heating fluid, a discharge conduit for the heating'fluid, and means 4interposed between the conduits for determining the number of sections traversed by the heatingffluid.

2. In a carburetor, a jacket portion, covering. substantially the entire outside wall of thecarburetor, means for subdividing the jacket portion into a vplurality of sections, a

supply conduit for heating fluid, a discharge conduit for the heating fluld, and a valve interposed between the conduits for determining the number of sections traversed by the heating fluid.

3. In a carburetor structure, a jacket covering substantially the entire. outside wall of thecarburetor and having a plurality of secftions, a conduit for supplying heating fluid to the jacket, a discharge conduit, and a valve for connecting certain of the sections in series or for bypassingl at least one of the sections between the supply and discharge conduits.

4. In a carburetor, a mixing chamber, an air duct, a source of fuel, a jacket covering substantially the entire outside wall of the carburetor and having a plurality of sections, one of the sections cooperating with the air duct and source of fuel, and means whereby the sections may be connected in series With ,a source of heating fluid or the section'cooperating with the air duct and fuel supply may be bypassed.

5. In a carburetor structure, a mixin chamber, an air duct, a source of heating fluidi, a jacket covering substantial-ly the entire outside wall of the carburetor and having a plurality of sections cooperating with different portions of the carburetor, and means readily accessible from above the carburetor for controlling the passage of heating fluid through the different sections of the jacket.

6. In a. carburetor structure, a mixing chamber, an air duct, a source ofheating fluid, a jacket covering substantially the'erftire outside Wall of the carburetor and having a plurality ofv sections cooperating with different portions of the carburetor,and a valve readily accessible from above the carburetor for controlling the passage of heating fluid throughthe different sections of the jacket.

7 In a carburetor structure, a mixing chamber, an air duct, a source of heating fluid, a jacket covering substantiallythe entire outside wall of the carburetor and having a plurality of sections cooperating with different portions of the carburetor, and a three-Way valve readily accessible from above the carburetor for controlling the passage of heating fluid through the different sections of the jacket.

8. In a carburetor, a jacket portion, covering substantially theV entire outside wall of the carburetor and means yfor sub-dividing the jacket portion into a plurality of sections, asupply conduit for heating fluid, a discharge.

conduit for the heating` fluid, and means inheating fluid, said means being effective for completely cutting off the flow of fluid to certain, .of said sections.

In testimony whereof I have hereunto set my hand.

ANTONIN BOULADE. 

